SQLServer 2008消除了每个表只能有1024个列的限制，这是通过一个名叫“稀疏列（sparsecolumns）”的选项来实现的。
SQL Server 2008 has lifted the limit of 1024 columns per table with a new option called "sparse columns".
该算法采用人们熟悉的树型数据结构，可以较为合理地表示稀疏校验矩阵中行与列中非零元素的跳转关系。
This algorithm used the data of tree structure, and could more reasonably the skipping relations of the non-zero elements in the rows and lines of the sparse check matrix.
结合列存储数据库系统与稀疏数据自身的特点，本文提出了一种列存储数据库系统适宜存储稀疏数据的观点，并给出稀疏数据库的设计方式。
Through analyzing the characteristics of sparse data, we conclude that it's suitable for column-oriented database to store sparse data and give the method of how to design sparse database.
前言： 目的：探讨正畸开辟间隙法与种植义齿结合治疗个别牙缺失和牙列稀疏错牙合畸形的临床效果。
Objective:The purpose is to research indications and effect of implant treatment in orthodontic treatment in the permanent dentition with missing teeth or significant spacing.
前言： 目的：探讨正畸开辟间隙法与种植义齿结合治疗个别牙缺失和牙列稀疏错牙合畸形的临床效果。
Objective:The purpose is to research indications and effect of implant treatment in orthodontic treatment in the permanent dentition with missing teeth or significant spacing.
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